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Demons in the North Atlantic : variability of deep ocean ventilation

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MacGilchrist_2021_GRL_Demons_NAOcean_VoR.pdf (1.643Mb)
Date
16/05/2021
Author
MacGilchrist, G. A.
Johnson, H. L.
Lique, C.
Marshall, D. P.
Keywords
Dense water formation
Labrador Sea
Lagrangian
North Atlantic
Ocean mixed layer
Ocean ventilation
GE Environmental Sciences
DAS
SDG 13 - Climate Action
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Abstract
Translation of atmospheric forcing variability into the ocean interior via ocean ventilation is an important aspect of transient climate change. On a seasonal timescale in the subtropics, this translation is mediated by a so-called "Demon" that prevents access to all except late-winter mixed-layer water. Here, we use an eddy-permitting numerical circulation model to investigate a similar process operating on longer (interannual) timescales in the subpolar North Atlantic. We find that variations in atmospheric forcing are mediated in their translation to the ocean interior, with year-to-year changes in the late-winter mixed layer depth being the critical factor. The signature of persistent strong atmospheric forcing driving deep mixed layers is preferentially ventilated to the interior when the forcing is ceased. Susceptibility to this effect depends on the location and density of subduction-with the rate at which newly ventilated water escapes its region of subduction being the crucial factor.
Citation
MacGilchrist , G A , Johnson , H L , Lique , C & Marshall , D P 2021 , ' Demons in the North Atlantic : variability of deep ocean ventilation ' , Geophysical Research Letters , vol. 48 , no. 9 , e2020GL092340 . https://doi.org/10.1029/2020GL092340
Publication
Geophysical Research Letters
Status
Peer reviewed
DOI
https://doi.org/10.1029/2020GL092340
ISSN
0094-8276
Type
Journal article
Rights
Copyright © 2021. American Geophysical Union. All Rights Reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1029/2020GL092340
Description
G. A. MacGilchrist is supported through NSF’s Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Project under the NSF Award PLR-1425989, with additional support from NOAA and NASA. HJ and DM were supported by the UK Natural Environment Research Council OSNAP project (NE/K010948/1). C. Lique was supported by the project MEDLEY funded by JPI Climate and JPI Oceans, under the agreement ANR-19-JPOC-0001. The hindcast was carried out within the European Drakkar project.
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  • University of St Andrews Research
URL
https://ora.ox.ac.uk/objects/uuid:055276b3-0849-4422-b93b-824009d6f7ed
URI
http://hdl.handle.net/10023/26336

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